hints/darwin.sh: Provide reference for poll issue #23792
Merged
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From OpenSSH 8.9 release notes:
For character-special devices like /dev/null, Darwin's poll(2) returns POLLNVAL when polled with POLLIN. Apparently this is Apple bug 3710161 - not public but a websearch will find other OSS projects rediscovering it periodically since it was first identified in 2005.
https://www.openssh.com/txt/release-8.9